* fix(workflows): don't crash on membership test against a non-iterable
the `in` / `not in` operators in _evaluate_simple_expression only guarded
`right is not None`, so `left in right` still raised a raw TypeError when the
right operand was any other non-iterable (int, bool, float). a condition like
`{{ inputs.tag in inputs.count }}` where count is a number crashed the whole
workflow run instead of evaluating.
nothing is contained in a non-iterable, so treat membership as False (`not in`
as True) via a new _safe_membership helper that swallows TypeError. this
generalizes the old None guard and mirrors _safe_compare, which already
catches TypeError for the ordering operators.
added a regression test; confirmed it fails on the pre-fix code (raw
TypeError) and that genuine list/substring membership still works.
* address review: float membership case + broaden _safe_membership docstring
- add a float right-operand assertion so the test matches its comment (was
claiming float coverage while only exercising int/bool/None).
- reword the _safe_membership docstring to describe TypeError generally
(non-iterable right is the common case, but also e.g. an unhashable left
against a set) rather than implying only the right operand matters.